Cast Notorious Throng for its prowl cost by paying 5, causing you to take an extra turn after this one.
Move to your next turn.
Cast Chthonian Nightmare by paying 1.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
Activate Chthonian Nightmare by paying EEE, sacrificing a creature with mana value 3 or less, and returning Chthonian Nightmare from the battlefield to your hand, returning Skullwinder from your graveyard to the battlefield.
When Skullwinder enters the battlefield, it triggers, returning Notorious Throng from your graveyard to your hand.
Cast Chthonian Nightmare by paying 1.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get EEE.
Activate Chthonian Nightmare by paying at most EEE, sacrificing Skullwinder, and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 3 or less from your graveyard to the battlefield.
Repeat.
This crafty loop begins by leveraging the combat damage of a Rogue to cast Notorious Throng for its prowl cost, granting you an extra turn to set up your engine. Once you cast Chthonian Nightmare, its entry trigger provides the initial energy needed to fuel its activated ability, allowing you to sacrifice a creature and bounce the enchantment while pulling Skullwinder out of your graveyard. When Skullwinder enters the battlefield, its trigger immediately brings Notorious Throng right back to your hand to be recast on the next extra turn, creating an infinite, self-sustaining cycle of extra turns and recursive value.